Carburetor



July 1, 1952 W. J. M SPEDON, 111

CARBURETOR Filed Oct. 16, 1946 FIG. l.

q 5 Sheets-Sheet l 9 INVENTOR.

- WILL/AM 'JI'MFSPEDOMZZI ATI'D RN EYS y 1952 w. J. M SPEDON,I|I 2,601,977

CARBURETOR Oct. 16, 5 Sheets-Sheet INVENTOR.

WILL/AM J. M SPEDON, E

J y 1952 w. J. MOSPEDONJII 2,601,977

CARBURETOR I Filed Oct. 16, 1946 5 Sheets-Sheet 4 A IN VEN TOR.

WILLIAM J. M.$PEDO/V,ZZ'

ATTORNEYS W. J. M SPEDON, 111

July 1, 1952 CARBURETOR 5 Sheets-Sheet 5 Filed Oct. 16, 1946 FIG. l3.

FIG. [4.

FIG. |5.

FIG. l6.

FIG.

I INVENTOR. WILL/AM ,J. MPSPEDOMZZZ AITU R N EYS in Figure .1;

Patented July 1, 1952 t UNITED STATES PATENT OFFICE CARBURETOR William J. McSpedon, III, Yonkers, N. Y. Application October 16, 1946, Serial No. 703,651

My present invention, in its broad aspect has to do with improvements in carburetors, and more particularly, it is my purpose to provide (1) an improved and unique vacuum, or suction operated fuel feed thereby. eliminating the usual pump mechanism for drawing fuel into the carburetor, (2) to facilitatev aligning the operating lever and the like with the instrument, board controls and the like, (3) to provide a novel and improved pressure release and adjustment to regulate the pressures builtuup in the mixing chamber to insure .auniform' mixture, :(4) to provide a novel and unique choke mechanism and throttle valve assembly, ('5) to attain by reason of down draft operation a better, more efficient, cleaner, and more accurately adjusted ,air supply, and to utilize such down draft to create suction or a partial vacuum to draw in thefuel thereby eliminating the usual pump, and (.6) to provide means (.for .controlling the spark through the vacuum. created in the manifold. In attainingthe above and other important objects and advantages I make use of a novel and practical fuel inlet having a novel and improved head, under which are the fuel outlets, such beingarranged'in the air passage from the head of the carburetorwhichis movable to align the carburetor controls. The fuel reservoirflis of constant level and is float controlled through an improved valve arrangement, "and the downfiow of air is guided and regulated-by a' choke mechanism, and the intake of fuel through'an improved adjustable valve. In addition-to the above,.I provide novel suppor-ts and brackets for the control wires from. the instrument board; and .;an

improved general. carburetor structure *withan adjustable, rotatable head .s'upportingthezair cleaners, and an improved arrangement of the mixing chamber, and butterfly with the adjacent vacuum spark plug automatic control.

In addition to theabove objects, advanta es, and changes structure, others will behereinafter apparent from the description and ;drawings, but it is understood that changes .in form, size, shape, construction and arrangementof parts may be .made withinmy broad inventive concept, and are within the .scope of the appendedclaims. I

In the drawings wherein I'have illustrated a preferredform of my invention: ,7 V

Figure l is a side elevationlooking towardjthe side onwhich most of the controls are mounted;

Figure 2 is, a vertical sectionthrough myearu or taken with t e 3: 'Q Q f .POS d'-t a 3 Claims. (01. 261-59) Figure 3 a side elevation with the carburetor turned from the position shownin Figure 1;

Figure 4 is a vertical section with the carburetor disposed as in Figure 3;

.Figure 5 is a vertical section with the carburetor turned from the position shown in Figure 1;

Figure 6 is a top plan view;

Figure 7 is a top plan view with the air chamber and air valve removed;

Figure 8 is a top plan view with both the air chamber and the fuel chamber cover removed;

Figure 9 .is abottom plan view of the head for the fuel pipe; 7

Figure -10 :is a top plan view of the head for the fuel pipe;

Figure 11 is a side view of the head for the fuel pipe;

Figure 12 is a section on the line l2l2 of ure .2;

Figure 13 is a section through the pressure adiusting andrelief valve; V v

Figure 14' is a top plan view of the fuel reservoir cover plate;

Figure 15 is a bottom plan view of the fuel reservoir cover plate; 7

Figure 16 is a top plan view of the air valve sprin a m and Figure 17 is aside elevation of my improved float.

In the drawings wherein like characters of reference are used to designate like or similar parts throughout the several views:

The numeral 1 designates the intake manifold of an internal combustion engine to which is coupled by flanges 2 and bolts 3, the carburetor supporting sleeve 4 having a butterfly valve 5 interpolated therein, connectedwith the instrument panel by the usual wire 1. The butterfly valve 5 is mounted by screws 6 in a shaft 8 journalled'in the bosses 8*, Fig. 3, on the walls of the sleeve and carries at one end .an operating lever 9. The lever 9 has a split hub .III held in clamping engagement with the; shaft 8 by a screw H, and its throw is regulated by screws 12 and 13. Tapped into the sleeve A at the butterfly valve is a connection M to .a .vacuum control for the spark. The sleeve dis flanged at l5 to form stops for screws 12 and I3. v

The-upper end H; of the sleeve 4 has the mixing chamber of the carburetor and is slightly enlarged .at its top end at H, Fig. 5, and ,providediwith a circumferentially spaced wall 18 adjustable 2601,97? If .j i

connected by a bottom l9 with the sleeve to provide a reservoir 29 which extends from a point slightly above the butterfly valve to the top of the sleeve. Tapped through the wall I8 and sleeve 4 near the bottom of the chamber or reservoir 29 is a tube 2| having a threaded end 22 and an enlarged head 23 formed with a needle valve seat 24 and inlet openings 25. Threaded into the enlarged head 23 is a needle control and. idling adjustment valve 28 having a handle 21. Suitable wrench engaging formations 28 are provided on the head of the tube and needle valve assembly for ready attachment and removal.

Floating on the fuel within the chamber is a float 29 having a U-shaped arm 39 carrying. a.

plate 3| pivoted in U-shaped bracket 32. The float 29 is reduced in thickness at-33 to, clear the bracket 32, and the arm may be formed of wire-as shown in Figure 1'7-bent downwardly at right angles as at 34 and extending through the cork body of the float and beaded over at 35. The bracket 32 has a threaded base 36 engaging the threaded end of fuel inlet pipe 31. The end of the fuel inlet pipe is enlarged and formed with a valve seat 38. A freely slidable square needle valve 39 is held off the valve seat by the pressure of fuel in the line, and the distance which the valve is off its seat-the extent of openin thereof-is regulated by the float 29 through plate 3! which bears against the head of the valve. Thefuel line 46 is coupled with the fuel intake pipe 31, and awrench engagin formation 4! is provided. To a boss 42 on the wall l8 beneath and to one side of the formation 4| is attached by a screw 43 a bracket 44, one end of which is turned at right angles as at 45 and bears against the formation 4i and the other end of which carries a clamp 46 for the operating wire 1. I

Seated upon a gasket 41 on the upper edge of the wall 18 or reservoir 29 is a fuel reservoir cover plate 48. The cover plate 49 has a flange 49, an annular rising side wall 56, a centrally located opening 5| and a downwardly sloping floor 52 from the wall 50 to the opening'Sl which leads into the annular sleeve part 53 of the cover plate which fits into the enlarged upper end 11 of the mixing chamber 16. A threaded opening 54-see Figures 13, 14 and l5-is provided in the cover plate which communicates with the reservoir 20. Removably and slidably mounted over the flange 49-and against the side wall 58 is a cylindrical head 55 which has a side wall 56 and a top 51 formed with a center opening '58 surrounded by an upstanding annular flange 59. A beveled part 89 at the-point where the flange joins the top provides a seat for a plate valve 6| pinned to a rod 62 slidably received in a bored boss 63 on' a transverse arm 64 formed on the flange 59. The bottom end of the rod 62 is seated in an opening 65 in a boss 66 on the downwardly curved arm 61 which is threaded at 68 to the pin 69 extending upwardly through the cover 51. A coil spring Ill extends about the rod 62 and bears against the bars 66 and plate valve 6i to hold the plate valve resiliently against its seat. Above the opening 58 and attached to the flange 59 is designed-to be attached a conventional form of air' strainer and cleaner (not shown) The pin 99. on which the arm 61 isattached has threaded toits upper end an adjusting nut Tl,- between which and a jam nut 12 on the pin 69 is an 'L-shaped lever B having a headed" pin 14; by

adjustment of the nut H the richness ofthe mixture can be regulated as well as idling adjustments. A spring 15 on the pin I4 extends through a slot I6 in the lever and bears against the nut H to hold it in adjusted position. The lever 13 is pivotally attached by pin 14 to a bell crank lever H. The pin 14 extends through an elongated slot 18 in one arm of the bell crank and the other arm is connected to the operating wire 19 to the instrument panel (not shown).

A'n L-shaped bracket 68 is fixed to the head by the screws BI and pivotally mounts the bell crank lever thereon by screw 82 so that when the operating wire is manipulated the bell crank is tilted to raise and lower the lever 13 and open and .close the air valve 8|.

Threaded in the opening 54 leading into the reservoir 20 through the cover is a pressure relief tube 83 which extends up through the head 54 and has outlets 84 through nut 85.

Engaged with the threaded end 22 of the fuel inlet tube 2| is an upwardly extending fuel inlet 86 which rises centrally of the fuel mixing chamber [5 to within the sleeve part 53. A head 81- shown in Figures 9, 10, and 11-is threadedly connected with the end of the inlet 86 by a sleeve 88 carrying a flange 89 spaced from a downwardly beveled plate 99. In the web 9! between the flange 89 and plate 98 are angular outlet openings 92, and the plate is kerfed at 93 to receive a screw driver or the like for adjusting or removing the head. Suction created by the manifold causes air to be drawn down past plate valve 61 against the pressure of spring 15 and down and around the head 81 in the direction of the arrows. This suction draws fuel through inlet 86 and out through outlets 92 beneath the plate 90. Theamount of fuel is adjusted by needle valve 26.

1 At the upper edge of the side wall l8 of the reservoir 20 are a plurality of lateral spaced bored bosses 94 through which extend the shanks 95 of upwardly extending clamping hooks 96, Hooks 96 seat in depressions 91 in the cylindrical head 55 to adjustably retain the head on the cover plate 48, .and the cover plate 48 on the reservoir 29. The shanks are threaded as at 99 to, receive nuts 99 by which the hooks are drawn down to clamp the head in'place, or loosened up so that the head may be rotated or turned to align the operating levers and the like with the operating wires and instrument board or panel. While I have mentioned an instrument panel in connection with the present carburetor, it is emphasized that the carburetor is one of general utility for use with any internal combustion engine, and not necessarily with power plants for automobiles and the like having instrument panels.

In operation as the butterfly valve 5 is opened, air will be drawn down through the cover 55 and into the mixing chamber within the sleeve 4 to receive fuel leaving fuel inlet head 88. Air is directed over the head by the conical surface 52 of the reservoir cover which hasa portion extending into the end of the mixing chamber sleeve 4. The head 88 lies within the depending sleeve or skirt portion of the cover 48. The fuel is supplied from a reservoir 20 over which the cover 48 extends. The cover 48 is formed to receive the air intakehead 55 whereby to make for a compact and simple construction. At the bottom of the reservoir is a throttle valve fitting which extends into the mixing chamber and to which fuel inlet tube 86- is connected. By this means the fuel supply is controlled. 2 The float 29 in the reservoir operates on valveelemerit-39 to maintain a constantsupply of ;f-uel in thereservoir. The float "is of ring shape to surround-the sleeve 4 and is cut away on one sideso as to provide less material to keep that side afloat and consequently when the fuel supply drops the recessed side of the float will drop to a greater extent and the arm 30 with the plate 3| thereon 'will engage the valve element 39, the arm 30' lying within the recess formed in the float.

Air valve 51 is secured to rod 52 vertically slidable in a guide 63, Fig. 2, curved arm 61 receives and supports the lower end of rod 62. Spring surrounds rod 62 and engages with valve 6i, and the boss 66 of the arm 61. The outer end of arm 61 has a threaded connection with an operating rod 69. Lever i3 is adjustably connected to the upper end of rod 69 whereby the tension of the spring Hi to hold the valve in its closed position may be adjusted. Ihe lever 13 is connected to bell crank lever H which is operated by wire 19 at the operators station.

From the foregoing it is believed that the operation and advantages of my invention will be apparent, but it is again emphasized that interpretation of the scope of my invention should only be conclusive when made in the light of the subjoined claims.

I claim:

1. In a carburetor for the fuel supply of internal combustion engines, the combination which comprises a vertically positioned tubular casing, a spaced circumferential wall extended around the upper end concentric therewith and connected at its bottom edge to the outer surface of the casing at a point spaced from the upper end providing a float chamber around the upper end of the tubular casing, an annular wall having its lower edge positioned on the upper edge of the circumferential wall, a cylindrical head positioned on the upper edge of the said annular wall, a conical shaped floor having the lower end thereof sloping downwardly toward the center and having a depending sleeve extended from the central part of the lower end downwardly into the upper end of the tubular casing, said sleeve having an annular shoulder on the outer surface and said shoulder and outer surface of the sleeve fitted with the upper end and inner surface of the tubular casing, respectively, a fuel supply connection extended through the said circumferential wall and into the float chamber, a fuel inlet tube extended from the lower end of the float chamber into the tubular casing and upwardly in the tubular casing to a point spaced from the upper end thereof, said fuel inlet tube communicating with the float chamber, a manually actuated needle valve extended into the said fuel inlet tube for controlling fuel supply through the tube, said cylindrical head having a neck on the upper end thereof with a valve seat in the lower end of the neck, a valve in the lower end of the neck of the cylindrical head positioned to coact with the said valve seat, and means resiliently urging the said valve upwardly against the said valve seat.

2. In a carburetor for the fuel supply of internal combustion engines, the combination which comprises a vertically positioned tubular casing, a spaced circumferential wall extended around the upper end concentric therewith and connected at its bottom edge to the outer surface of the casing at a point spaced from the upper end providing a fioat'chamberaround the upper end of the tubular casing, an annular wall having its'lower edge positioned on the upper edge of the circumferential wall, a cylindrical head positioned on the upper edge of the said annular wall, a conical shaped floor having the lower end thereof sloping downwardly toward the center and'having a depending sleeve extended from the central part of the lower end downwardly into the upper "end of the tubular casing, said sleeve having an annular shoulder on the outer surface and said shoulder and outer surface of the sleeve fitted with the upper end and inner surface of the tubular casing, respectively, a fuel supply connection extended through the said circumferential wall and into the float chamber, a fuel inlet tube extended from the lower end of the float chamber into the tubular casing and upwardly in the tubular casing to a point spaced from the upper end thereof, said fuel inlet tube communicating with the float chamber, a manually actuated needle valve extended into the said fuel inlet tube for controlling fuel supply through the tube, said fuel inlet tube having a spray head on the upper end thereof and positioned in the depending sleeve of the cylinder head and said spray head having radially disposed upwardly extended orifices therethrough, said cylindrical head having a neck on the upper end thereof with a valve seat in the lower end of the neck,,a valve in the lower end of the neck of the cylindrical head positioned to coact with the said valve seat, and means resiliently urging the said valve upwardly against the said valve seat.

3. In a carburetor for the fuel supply of internal combustion engines, the combination which comprises a vertically positioned tubular casing, a spaced circumferential wall extended around the upper end concentric therewith and connected at its bottom edge to the outer surface of the casing at a point spaced from the upper end providing a float chamber around the upper end of the tubular casing, an annular wall having itslower edge positioned on the upper edge of the circumferential wall, a cylindrical head positioned on the upper edge of the said annular wall, a conical shaped floor having the lower end thereof sloping downwardly toward the center and having a depending sleeve extended from the central part of the lower end downwardly into the upper end of the tubular casing, said sleeve having an annular shoulder on the outer surface and said shoulder and outer surface of the sleeve fitted with the upper end and inner surface of the tubular casing, respectively, afuel supply connection extended through the said circumferential wall and into the float chamber, a float in said float chamber having means controlling the fuel supply through the said fuel supply connection, a fuel inlet tube extended from the lower end of the float chamber into the tubular casing and upwardly in the tubular casing to a point spaced from the upper end thereof, said fuel inlet tube communicating with the float chamber, a manually actuated needle valve extended into the said fuel inlet tube for controlling fuel supply through the tube, said cylindrical head having a neck on the upper end thereof with a valve seat in the lower end of the neck, a valve in the lower end of the neck of the cylindrical head positioned to coact with the said valve seat, and means resiliently urging the said valve upwardly against the said Number Name Date valve seat. 1,240,200 Hagar Sept. 18, 1917 WILLIAM J. McSPEDON, III. 1,355,960 Goldberg et a1. Oct. 19, 1920 1,506,229 Ensign Aug. 26, 1924 REFERE CES CITED 5 1,613,706 Johnson Jan. 11, 1927 The following references are of record in the 1,733,273 Beach 1930 fil of t t t; 1,927,426 Wahlmark Sept. 19, 1933 2,068,838 Aseltine Jan. 26, 1937 UNITED STATES PATENTS I 2,163,139 Brandon June 20, 1939 Number Name Date 10 2,364,987 Lee Dec. 12, 1944 857,275 Gaither June 18, 1907 

